This installation is for Micro Trains line Z scale GP35 and features the MZA4 decoder.
Recently, Micro Train changed the chassis design and our MZA 4 decoder will no longer fit into new locomotive releases (including GP35).
Click HERE for more informations.
In case of any questions, contact firstname.lastname@example.org or call (215)-453-9145
Remove the body shell and handrails by gently pulling up on the shell. Remove the fuel tank.
First, using tweezers, remove the two springs located on either side of the Locomotive (take care not to crush the spring's coils) then slide the original lighting board out.
Above is pictured the Locomotive's chassis with its shell taken off and without the original light board. Loosen the six (three on each side) screws (circled in red) holding the frame halves together about one turn, but do not remove the screws. Just slightly spread the top half of the frames apart, but do not take them completely apart. Spread them just enough to fit the MZA4 decoder between the post.
Gently fit the MZA4 so that all four decoder contacts (circled in red) contact the four chassis posts. Track power connection to the decoder is achieved by a pressure fit between the frame post. Do not attempt to slide the decoder into the slots in the posts the way the original board was. The decoder should be level with the slots but not in them. After the decoder is in place re-tighten all six screws.
Attach the half-circle end of the spring to the decoder, and the semi-circle side to the motor tab. Follow spring direction as shown in the photo above.
This pictures shows electrical contact between the MZA4 and the frame.
Optionally we recommend using Magnet Wire to replace the "hard to work with" springs that come with the locomotive.
Here is the picture of MZA4 decoder installed using Magnet Wire.
Important Soldering Tip
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157
Other solder tips
When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder, the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire